Add taps to the REST inteface for perforamance tracking and resource reporting.
Replace more complex nested taps with simpler timer taps.
merge trunk
Move the taps from the creation point to the execution point to correctly capture execution time.
Clean up a few imports.
merge tjoneslo: Add a collection of taps into the REST interface.

https://code.launchpad.net/~tjoneslo/akiban-server/add-rest-taps/+merge/159943